There is a modified arp command built into the system. You can see any MAC address connected and communicating with FREESCO simply by going to the control panel and using the "connected clients" -> "list" button. From a command line because it is a stripped arp command it is called "arpf"

If you are afraid that you might make a mistake. The chances are high that you will never learn anything.

In order to get an arp entry the machine must have some sort of communication with the router. So all that is needed is to ping it's IP address directly from the router and after that has happened there will be an arp (mac) entry for that IP address for at least five minutes. If it is set to not respond to pings then just pull up it's web control panel to force some sort of communication by using the "snarf 192.168.1.2" command from the console. Either way will force it to communicate directly with the router and create an arp entry.

If you are afraid that you might make a mistake. The chances are high that you will never learn anything.